Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign according to a first embodiment;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is the fifth image thereof;

FIG. 6 is the sixth image thereof;

FIG. 7 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign according to a second embodiment;

FIG. 8 is the second image thereof;

FIG. 9 is the third image thereof;

FIG. 10 is the fourth image thereof;

FIG. 11 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign according to a third embodiment;

FIG. 12 is the second image thereof;

FIG. 13 is the third image thereof;

FIG. 14 is the fourth image thereof;

FIG. 15 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing our newdesign according to a fourth embodiment;

FIG. 16 is the second image thereof;

FIG. 17 is the third image thereof; and,

FIG. 18 is the fourth image thereof.

The outer perimeter broken line depicts a display screen or portionthereof and forms no part of the claimed design. The remaining brokenlines in the figures depict portions of the transitional graphical userinterface and form no part of the claimed design.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1-6, FIGS. 7-10, FIGS. 11-14, andFIGS. 15-18. The process or period in which one image transitions toanother image forms no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withtransitional graphical user interface, as shown and described.